Division of Physiology, Department of Oral Biology, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.
Arch Oral Biol. 2009 Nov;54(11):1022-8. doi: 10.1016/j.archoralbio.2009.08.006. Epub 2009 Sep 16.
Regions of a belly in a masseter muscle have been suggested to be activated independently in order to enable complex jaw-movements. However a regional difference of the masseter blood flow (MBF) is still unclear although the blood flow is one of the most important factors during activation of the muscle. The present study examined regional differences in blood flow in rat masseter muscle by comparing blood flow values at the inferior, centre, superior, anterior, and posterior regions of the muscle belly using a laser speckle imaging flowmeter with or without sympathetic and parasympathetic stimulation. Regional differences in blood flow levels were observed in each region of the masseter muscle belly during rest. Additionally, amplitudes of blood flow changes evoked by electrical stimulation of parasympathetic and sympathetic nerves differed among regions. These results demonstrate the regional differences in hemodynamics during rest, sympathetic vasoconstriction (including the recovery phase), and parasympathetic vasodilatation in rat masseter muscle.
有人提出，为了实现复杂的下颌运动，咀嚼肌的各个区域可以独立激活。然而，尽管血液流动是肌肉激活过程中最重要的因素之一，但咀嚼肌血流量（MBF）的区域差异仍不清楚。本研究使用激光散斑成像流量计，在有或没有交感和副交感神经刺激的情况下，比较了咀嚼肌腹下部、中部、上部、前侧和后侧的血流值，以检查大鼠咀嚼肌血流的区域差异。在休息时，观察到咀嚼肌腹的每个区域的血流水平存在差异。此外，副交感神经和交感神经电刺激引起的血流变化幅度在各个区域也不同。这些结果表明，在大鼠咀嚼肌中，静息状态、交感神经血管收缩（包括恢复阶段）和副交感神经血管舒张时存在血液动力学的区域差异。
Zotero 插件